.footer {
  padding-bottom: 0.5rem;
}
.footer a {
  display: inline-block;
}
.footer .nav {
  position: fixed;
  z-index: 100;
  bottom: 0;
  left: 0;
  right: 0;
  max-width: 750px;
  min-width: 320px;
  height: 50px;
  background-color: #fafafa;
  border-top: 1px solid #d9d9d9;
  margin: 0 auto;
}
.footer .nav ul {
  display: -webkit-box;
  width: 100%;
}
.footer .nav ul li {
  -webkit-box-flex: 1;
  text-align: center;
}
.footer .nav ul li a {
  margin-top: 5px;
  font-size: 12px;
  color: #666666;
  text-align: center;
}
.footer .nav ul li a span {
  background-size: 23px;
  background-repeat: no-repeat;
  display: block;
  width: 23px;
  height: 23px;
  margin: 0 auto;
}
